CN217904273U - Switching power supply with wide output voltage range - Google Patents
Switching power supply with wide output voltage range Download PDFInfo
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- CN217904273U CN217904273U CN202220969370.6U CN202220969370U CN217904273U CN 217904273 U CN217904273 U CN 217904273U CN 202220969370 U CN202220969370 U CN 202220969370U CN 217904273 U CN217904273 U CN 217904273U
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Abstract
The utility model discloses a switching power supply with wide output voltage range, which comprises a first switching control module, a first rectifying module, a second switching control module, a second rectifying module and a switching module, wherein the output end of the first switching control module is connected with the input end of the first rectifying module; the positive output end of the first rectifying module is connected with the first input end of the switch module, and the negative output end of the first rectifying module is connected with the second input end of the switch module; the output end of the second switch control module is connected with the input end of a second rectifying module, the positive electrode output end of the second rectifying module is connected with the third input end of the switch module, and the negative electrode output end of the second rectifying module is connected with the fourth input end of the switch module; the switch module is used for controlling the anode output end and the cathode output end of the first rectifying module and the anode output end and the cathode output end of the second rectifying module to be connected in series or in parallel, so that the output voltage range and the output current range of the switch power supply are improved.
Description
Technical Field
The utility model relates to a direct current power supply technical field especially relates to a switching power supply of output voltage wide range.
Background
In the prior art, due to the influence of a series of factors such as transformer turn ratio, MOS transistor voltage stress, conversion efficiency and the like, the output voltage range of the current switching power supply is narrow, the output voltage range can only reach 3Vdc to 24Vdc, but some devices need to use 48Vdc during charging, and can only be designed to be single-voltage output, and the devices powered by the devices and the 3Vdc cannot share the same switching power supply, which increases the number of switching power supplies used by users, and causes resource waste.
Therefore, how to increase the voltage and current output range of the switching power supply is a problem that needs to be solved urgently.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a switching power supply with a wide output voltage range to solve the problem that the narrow output voltage and current ranges of the switching power supply in the prior art affect the charging of the device.
In view of the above object, a switching power supply with a wide output voltage range includes: first switch control module, first rectifier module, second switch control module, second rectifier module and switch module, wherein: the output end of the first switch control module is connected with the input end of the first rectifying module; the positive output end of the first rectifying module is connected with the first input end of the switch module, and the negative output end of the first rectifying module is connected with the second input end of the switch module; the output end of the second switch control module is connected with the input end of the second rectification module, the positive output end of the second rectification module is connected with the third input end of the switch module, and the negative output end of the second rectification module is connected with the fourth input end of the switch module; the switch module is used for controlling the anode output end and the cathode output end of the first rectification module and the anode output end and the cathode output end of the second rectification module to be connected in series or in parallel.
Optionally, the switch module includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, an input end of the first switch tube is connected to an anode output end of the first rectifier module, and an output end of the first switch tube is used for connecting a load; the input end of the second switching tube is connected with the anode output end of the second rectifying module, and the output end of the second switching tube is connected with the anode output end of the first rectifying module; the input end of the third switching tube is connected with the negative output end of the first rectifying module, and the output end of the third switching tube is connected with the positive output end of the second rectifying module; the input end of the fourth switch tube is connected with the negative output end of the first rectification module, and the output end of the fourth switch tube is connected with the negative output end of the second rectification module.
Optionally, the switch module is configured to control the positive output end and the negative output end of the first rectification module and the positive output end and the negative output end of the second rectification module to be switched from series connection to parallel connection, so as to increase an output current of the switching power supply; or the parallel connection is switched into the series connection, so as to improve the output voltage of the switching power supply.
Optionally, the switching power supply further includes:
the control module is respectively connected with the control ends of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube, and is used for controlling the second switch tube and the fourth switch tube to be conducted and the third switch tube to be closed and controlling the first switch tube to be conducted when the output current is increased, so that the parallel connection between the positive output end and the negative output end of the first rectifying module and the second rectifying module is realized; the control module is used for controlling the conduction of the third switch tube, the closing of the second switch tube and the fourth switch tube and controlling the conduction of the first switch tube when the output voltage is increased, so that the first rectification module is connected with the anode output end and the cathode output end of the second rectification module in series.
Optionally, the first switch control module includes: the output end of the first PWM controller is connected with the input end of the first driving circuit, the output end of the first driving circuit is connected with the control end of the first rectification control switch tube, and the input end and the output end of the first rectification control switch tube are serially arranged in the first rectification module; the switching power supply further comprises a first feedback and protection module, a first optical coupler is arranged in the first feedback and protection module, the input end of the first optical coupler is connected with the positive output end of the first rectifying module, and the output end of the first optical coupler is connected with the input end of the first PWM controller.
Optionally, the second switch control module includes: the output end of the second PWM controller is connected with the input end of the second driving circuit, the output end of the second driving circuit is connected with the control end of the second rectification control switch tube, and the input end and the output end of the second rectification control switch tube are serially arranged in the second rectification module; the switching power supply further comprises a second feedback and protection module, a second optical coupler is arranged in the second feedback and protection module, the input end of the second optical coupler is connected with the positive output end of the second rectifying module, and the output end of the second optical coupler is connected with the input end of the second PWM controller.
Optionally, the first rectifying module includes: the first isolation transformer, the first RCD absorption circuit and the first rectifier chip, wherein a primary side branch of the first isolation transformer is connected with the first RCD absorption circuit in parallel, and the primary side branch is connected with the input end and the output end of the first rectifier control switch tube in series; the first secondary side branch of the first isolation transformer is connected with the input end of the first rectifying chip, and the output end of the first rectifying chip is connected with the switch module.
Optionally, the first isolation transformer is provided with a second secondary branch, an anode output end of the second secondary branch is connected with a power supply end of the first PWM controller through a diode, and an anode output end of the second secondary branch is connected with a first charging capacitor through the diode.
Optionally, the second rectification module includes:
the primary side branch of the second isolation transformer is connected with the second RCD absorption circuit in parallel, and the primary side branch is connected with the input end and the output end of the second rectification control switch tube in series; and the first secondary branch of the second isolation transformer is connected with the input end of the second rectifying chip, and the output end of the second rectifying chip is connected with the switch module.
Optionally, the second isolation transformer is provided with a second secondary branch, an anode output end of the second secondary branch is connected with the power supply end of the second PWM controller through a diode, and an anode output end of the second secondary branch is connected with a second charging capacitor through the diode.
The technical scheme has the following beneficial effects:
the utility model discloses a switching power supply, through setting up the switch module that can make the output of first rectifier module, second rectifier module carry out the series-parallel switch, when needing to improve output voltage, control the output of first rectifier module, second rectifier module and carry out the series connection; when the output current needs to be increased, the output ends of the first rectifying module and the second rectifying module are controlled to be connected in parallel, so that the output voltage range and the output current range of the switching power supply are increased.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a circuit diagram of a switching power supply provided in an embodiment of the present invention;
fig. 2 is a circuit diagram of a switching power supply provided in an embodiment of the present invention;
the symbols are as follows:
1. the AC input and rectification filter module; 2. a first switch control module; 3. a first rectifying module; 4. a second switch control module; 5. a second rectification module; 6. a switch module; 7. a first feedback and protection module; 8. a second feedback and protection module; u6 and a control module.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
In one embodiment, there is provided a switching power supply with a wide range of output voltages, as shown in fig. 1, the switching power supply including:
AC input and rectification filter module 1, first switch control module 2, first rectifier module 3, first feedback and protection module 7, second switch control module 4, second rectifier module 5, second feedback and protection module 8 and switch module 6, control module U6, wherein:
the AC input and rectification filter module is used for inputting an alternating current signal and rectifying and filtering the alternating current signal, the output end of the AC input and rectification filter module is respectively connected with the input ends of the first switch control module and the second switch control module, and the first switch control module and the second switch control module are used for performing PWM control on the input rectification signal to generate a pulsating direct current signal.
The output end of the first switch control module is connected with the input end of the first rectifying module so as to output a pulsating direct current signal to the input end of the first rectifying module; the positive output end of the first rectifying module is connected with the first input end L1 of the switch module, and the negative output end of the first rectifying module is connected with the second input end L2 of the switch module.
Similarly, the output end of the second switch control module is connected with the input end of the second rectification module so as to output an alternating current signal to the input end of the second rectification module; and the positive output end of the second rectifying module is connected with the third input end L3 of the switch module, and the negative output end of the second rectifying module is connected with the fourth input end L4 of the switch module.
The switch module is used for controlling the anode output end and the cathode output end of the first rectifying module to be connected with the anode output end and the cathode output end of the second rectifying module in series or in parallel. And the control module is provided with a control end, and the control end is connected with the switch module and is used for controlling the switch module to realize series-parallel switching of the output end of the first rectifying module and the output end of the second rectifying module.
In this embodiment, an input end of the first feedback and protection module is connected to an output end of the control module and is configured to obtain a voltage Vout (i.e., an output voltage of the switching power supply) at an output end of the switching module, an output end of the first feedback and protection module is connected to an input end of the first switching control module and is configured to feed back the output voltage Vout of the switching power supply, and the first switching control module performs PWM control according to a magnitude of the output voltage and adjusts the generated ac signal, so as to stabilize the output voltage of the switching power supply.
In this embodiment, an input end of the second feedback and protection module is connected to an output end of the control module and is configured to obtain a voltage Vout (i.e., an output voltage of the switching power supply) at an output end of the switching module, an output end of the second feedback and protection module is connected to an input end of the second switching control module and is configured to feed back the output voltage Vout of the switching power supply, and the second switching control module performs PWM control according to a magnitude of the output voltage and adjusts the generated ac signal, so as to stabilize the output voltage of the switching power supply.
In the switching power supply of the embodiment, the switching module which can switch the output ends of the first rectifying module and the second rectifying module in series-parallel connection is arranged, so that the output ends of the first rectifying module and the second rectifying module are controlled to be connected in series when the output voltage needs to be increased; when the output current needs to be provided, the output ends of the first rectifying module and the second rectifying module are controlled to be connected in parallel, so that the output voltage range and the output current range of the switching power supply are improved.
In one embodiment, there is provided a switching power supply with a wide range of output voltages, as shown in fig. 2, the switching power supply including:
AC input and rectification filter module 1, first switch control module 2, first rectifier module 3, first feedback and protection module, second switch control module 4, second rectifier module 5, second feedback and protection module and switch module 6, control module U6, wherein:
the AC input and rectifying filter module 1 includes: fuse F1, thermistor RT1, X electric capacity CX1, bleeder resistance R2R 4, common mode inductance LF1, rectifier bridge stack BD1, electrolytic capacitor EC7 for alternating current converts to direct current and EMI and suppresses.
The first switch control module 2 includes: the PWM controller comprises a first PWM controller U2, a first driving circuit and a first rectification control switch tube Q4, wherein the output end of the first PWM controller U2 is connected with the input end of the first driving circuit, the output end of the first driving circuit is connected with the control end of the first rectification control switch tube Q4, and the input end and the output end of the first rectification control switch tube Q4 are serially arranged in a first rectification module.
As shown in fig. 2, the first driving circuit includes resistors R10 and R12 and a diode D3, the diode D3 is connected in series with the resistor R10, and the resistor R12 is connected in parallel to the series end of the diode D3 and the resistor R10.
In this embodiment, the first PWM controller U2 has 6 pins, pin 1 of U2 is connected to the negative electrode of EC1, pin 2 of U2 is connected to pin 4 of optocoupler U3 for voltage feedback, C3 is connected in parallel between pin 1 and pin 2 of U2 to filter interference signals, pin 3 of U2 is connected to the common point of resistors R9 and R11 for detecting signals on the auxiliary winding of transformer T1 to realize output overvoltage protection of the first rectifier module 3, pin 4 of U2 is connected to the common point of R14 and C4 for detecting output power of the first rectifier module 3, and pin 5 of U2 is connected to the common point of resistors R7, R8 and electrolytic capacitor EC4 for realizing startup and power supply of U2; the pin 6 of the U2 is connected to a common point of the resistors R10 and R12, and forms a first driving circuit through the resistors R10 and R12 and the diode D3, and is connected to the gate of the first rectification control switch Q4 for driving the switch Q4 to be turned on and off.
The first rectification module 3 includes: the first isolation transformer T1A, a first RCD absorption circuit and a first rectifier chip U1, wherein the first RCD absorption circuit comprises resistors R1, R5 and R6, a capacitor C2 and a diode D1, the resistors R5 and R6 are connected in parallel, the resistor R1 is connected in parallel with the capacitor C2, and the cathode of the diode D1 is connected with the parallel ends of the resistors R5 and R6.
In fig. 2, a primary side branch of a first isolation transformer T1A is connected in parallel with a first RCD absorption circuit, and the primary side branch is connected in series with an input end and an output end of a first rectification control switch tube Q4; the first secondary side branch of the first isolation transformer T1A is connected with the input end of the first rectifying chip U1, and the output end of the first rectifying chip U1 is connected with the switch module.
In this embodiment, the first isolation transformer is provided with a second secondary branch T1B, and an anode output end of the second secondary branch T1B is connected to the power supply terminal VCC of the first PWM controller U2 and the first charging capacitor EC4 through a diode D2. In fig. 2, a pin 3 of the transformer T1A is connected to the anode of the diode D2, the cathode of the diode D2 is connected in series with the resistor R8, and then filtered by the electrolytic capacitor EC4 to supply power to a pin 5 of the first PWM controller U2. In this embodiment, the output end of the first rectification module 3 is further connected in parallel with two electrolytic capacitors EC2 and EC3 for voltage stabilization.
The first feedback and protection module includes: the input end U3A of the first optical coupler is connected with the positive output end VOUT1 of the first rectifying module and the collecting end P15 of the control module U6, and the output end U3B of the first optical coupler is connected with the input end of the first PWM controller U2 and used for achieving output voltage feedback adjustment of the first filtering module and achieving multiple protection functions.
The second switch control module 4 includes: the output end of the second PWM controller U5 is connected with the input end of the second driving circuit, the output end of the second circuit is connected with the control end of the second rectification control switch tube Q6, and the input end and the output end of the second rectification control switch tube Q6 are serially arranged in the second rectification module.
As shown in fig. 2, the second driving circuit includes resistors R24 and R26 and a diode D6, the diode D6 is connected in series with the resistor R24, and the resistor R26 is connected in parallel to the series end of the diode D3 and the resistor R24.
In this embodiment, the second PWM controller U5 has 6 pins, pin 1 of U6 is connected to the negative electrode of EC1, pin 2 of U6 is connected to pin 4 of the second optocoupler U7 for voltage feedback, the capacitor C7 is connected in parallel between pin 1 and pin 2 of U6 to filter interference signals, pin 3 of U6 is connected to a common point of resistors R23 and R25 for detecting signals on the auxiliary winding T2B of the transformer T2 to realize output overvoltage protection of the second rectifier module, pin 4 of U5 is connected to a common point of resistor R28 and capacitor C8 for detecting output power of the second rectifier module, and pin 5 of U5 is connected to a common point of resistors R18 and R21 and the electrolytic capacitor EC8 for realizing startup and power supply of U5; the pin 6 of the U5 is connected to the common point of the resistors R24 and R26, and a second driving circuit is formed by the resistors R24 and R26 and the diode D6, and connected to the gate of the second rectification control switch Q6, for driving the switch Q6 to be turned on and off.
The second rectifying module 5 includes: the second isolation transformer T2A, a second RCD absorption circuit and a second rectifier chip U4, wherein the second RCD absorption circuit comprises resistors R17, R18 and R19, a capacitor C6 and a diode D4, the resistors R19 and R20 are connected in parallel, the resistor R17 is connected in parallel with the capacitor C6, and the cathode of the diode D6 is connected with the parallel ends of the resistors R19 and R20.
In fig. 2, the primary side branch of the second isolation transformer T2A is connected in parallel with the second RCD absorption circuit, and the primary side branch is connected in series with the input end and the output end of the second rectification control switch tube Q6; the first secondary side branch of the second isolation transformer T2A is connected with the input end of the second rectifier chip U4, and the output end of the second rectifier chip U4 is connected with the switch module.
In this embodiment, the second isolation transformer is provided with a second secondary branch T2B, and an anode output end of the second secondary branch T2B is connected to the power supply terminal VCC and the second charging capacitor EC8 of the second PWM controller U5 through a diode D5. In fig. 2, a pin 3 of the transformer T2A is connected to the anode of a diode D5, the cathode of the diode D5 is connected in series with a resistor R22, and then filtered by an electrolytic capacitor EC8 to supply power to a pin 5 of the second PWM controller U5. In this embodiment, the output terminal VOUT2 of the second rectifying module is further connected in parallel with two electrolytic capacitors EC5 and EC6 for voltage stabilization.
The second feedback and protection module includes: and the input end U8A of the second optical coupler is connected with the positive output end VOUT2 of the second rectifying module and the acquisition end P17 of the control module U6, and the output end U8B of the second optical coupler is connected with the input end of the second PWM controller U5, so that the output voltage feedback regulation of the second filtering module is realized, and multiple protection functions are realized simultaneously.
The switch module 6 includes: the input end of the first switch tube Q1 is connected with the positive output end VOUT1 of the first rectifying module, and the output end of the first switch tube Q1 is used for being connected with a load through a USB interface; the input end of the second switching tube Q2 is connected with the positive output end VOUT2 of the second rectifier module, and the output end of the second switching tube Q2 is connected with the positive output end VOUT1 of the first rectifier module; the input end of the third switching tube Q3 is connected with the negative output end GND1 of the first rectifying module, and the output end of the third switching tube Q3 is connected with the positive output end VOUT2 of the second rectifying module; the input end of the fourth switch tube Q5 is connected with the negative output end GND1 of the first rectification module, and the output end of the fourth switch tube Q5 is connected with the negative output end GND2 of the second rectification module.
And the control module U6 is respectively connected with the control ends of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q5, and the control module U6 is used for controlling the conduction of the second switch tube Q2 and the fourth switch tube Q5 and the closing of the third switch tube Q3 when the output current is improved and controlling the conduction of the first switch tube Q1 so as to realize the parallel connection between the positive output end and the negative output end of the first rectifying module and the second rectifying module.
The control module U6 is configured to control the third switching tube Q3 to be turned on, the second switching tube Q2 and the fourth switching tube Q5 to be turned off, and control the first switching tube Q1 to be turned on when the output voltage is increased, so as to realize series connection between the first rectifying module and the positive output end and the negative output end of the second rectifying module.
In fig. 2, a control module U6 has a plurality of ports, a port P1 of U6 is connected to a pin 2 of a second optocoupler U8 and used for voltage feedback control of the output of the second rectifier module, a port P2 of U6 is connected to the negative electrode of the output of the first rectifier module, a port P3 of U6 is connected to the negative electrode of the output of the second rectifier module and is also connected to one end of R31, and a port P4 of U6 is connected to C9 to ground and used for power supply filtering of the control module; the port P5 of U6 is connected with the negative pole of Type-C mouth (USB interface module), connects the other end of R31 simultaneously for detect the output current of Type-C mouth.
The port P6 of U6 is the communication port CC1 and connects the A5 of Type-C mouth, the port P7 of U6 is communication port D + and connects Type-C mouth A6, B6, the port P8 of U6 is communication port D-and connects Type-C mouth A7, B7, the port P9 of U6 is communication port CC2 and connects Type-C's B5, the port P10 of U6 connects the positive pole of Type-C mouth and is used for detecting whether there is output voltage and discharge, the port P11 of U6 connects the grid of switch tube Q1, the on-off control that is used for switch tube Q1, the port P12 of U6 connects Q2 grid and is used for the on-off control of switch tube Q2, the port P13 of U6 connects the grid of Q5, the on-off control that is used for Q5, the port P14 of U6 connects the grid of switch tube Q3, the on-off control that is used for switch tube Q3, the port P15 of U6 connects the positive pole of the output of first rectifier module output, the output voltage of first rectifier module, the detection U6 connects the detection output voltage of the first rectifier module P17, the rectification output voltage of the first rectifier module is used as the rectification output loop circuit.
In this embodiment, the control module U6 functions as: control and detect first rectifier module and second rectifier module's output voltage, simultaneously according to communication interface D +, D-, CC1 above the Type-C interface, CC2 acquires the charging voltage of terminal equipment demand, control two way output voltage's relation of connection, first rectifier module and second rectifier module's output voltage constitutes the parallel relation when the Type-C interface needs low-voltage heavy current, first rectifier module and second rectifier module output voltage constitute the relation of establishing ties when the Type-C interface needs high-voltage low current.
The switching power supply of this embodiment utilizes the control MOS pipe to constitute switch module, carries out the connected mode of branch road gate, thereby connects the switching power supply output voltage of two way rectifier module in series and makes output voltage improve 2 times, thereby utilizes the control MOS pipe to constitute switch module, carries out the connected mode of branch road gate, thereby realizes parallelly connected the switching power supply output voltage of two way rectifier module and improves 2 times the electric current when making low voltage output.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A switching power supply with a wide output voltage range, comprising:
first switch control module, first rectifier module, second switch control module, second rectifier module and switch module, wherein:
the output end of the first switch control module is connected with the input end of the first rectifying module; the positive output end of the first rectifying module is connected with the first input end of the switch module, and the negative output end of the first rectifying module is connected with the second input end of the switch module;
the output end of the second switch control module is connected with the input end of the second rectifying module, the positive output end of the second rectifying module is connected with the third input end of the switch module, and the negative output end of the second rectifying module is connected with the fourth input end of the switch module;
the switch module is used for controlling the anode output end and the cathode output end of the first rectifying module to be connected with the anode output end and the cathode output end of the second rectifying module in series or in parallel.
2. The switching power supply according to claim 1, wherein the switching module comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, an input end of the first switching tube is connected with a positive output end of the first rectifying module, and an output end of the first switching tube is used for connecting a load; the input end of the second switching tube is connected with the anode output end of the second rectifying module, and the output end of the second switching tube is connected with the anode output end of the first rectifying module; the input end of the third switching tube is connected with the negative output end of the first rectifying module, and the output end of the third switching tube is connected with the positive output end of the second rectifying module; the input end of the fourth switch tube is connected with the negative output end of the first rectification module, and the output end of the fourth switch tube is connected with the negative output end of the second rectification module.
3. The switching power supply according to claim 1 or 2, wherein the switching module is configured to control the positive output end and the negative output end of the first rectifying module and the positive output end and the negative output end of the second rectifying module to be switched from series connection to parallel connection, so as to increase the output current of the switching power supply; or the parallel connection is switched into the series connection, so as to improve the output voltage of the switching power supply.
4. The switching power supply according to claim 2, wherein the switching power supply further comprises:
the control module is respectively connected with the control ends of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube, and is used for controlling the second switch tube and the fourth switch tube to be conducted and the third switch tube to be closed and controlling the first switch tube to be conducted when the output current is increased, so that the parallel connection between the positive output end and the negative output end of the first rectifying module and the second rectifying module is realized;
the control module is used for controlling the conduction of the third switch tube, the closing of the second switch tube and the fourth switch tube and controlling the conduction of the first switch tube when the output voltage is increased, so that the first rectification module is connected with the anode output end and the cathode output end of the second rectification module in series.
5. The switching power supply of claim 1, wherein the first switch control module comprises: the output end of the first PWM controller is connected with the input end of the first driving circuit, the output end of the first driving circuit is connected with the control end of the first rectification control switch tube, and the input end and the output end of the first rectification control switch tube are serially arranged in the first rectification module;
the switching power supply further comprises a first feedback and protection module, a first optical coupler is arranged in the first feedback and protection module, the input end of the first optical coupler is connected with the positive output end of the first rectifying module, and the output end of the first optical coupler is connected with the input end of the first PWM controller.
6. The switching power supply of claim 1, wherein the second switch control module comprises: the output end of the second PWM controller is connected with the input end of the second driving circuit, the output end of the second driving circuit is connected with the control end of the second rectification control switch tube, and the input end and the output end of the second rectification control switch tube are serially arranged in the second rectification module;
the switching power supply further comprises a second feedback and protection module, a second optical coupler is arranged in the second feedback and protection module, the input end of the second optical coupler is connected with the positive output end of the second rectifying module, and the output end of the second optical coupler is connected with the input end of the second PWM controller.
7. The switching power supply according to claim 5, wherein said first rectification module comprises: the first isolation transformer, the first RCD absorption circuit and the first rectifier chip, wherein a primary side branch of the first isolation transformer is connected with the first RCD absorption circuit in parallel, and the primary side branch is connected with the input end and the output end of the first rectifier control switch tube in series; the first secondary side branch of the first isolation transformer is connected with the input end of the first rectifying chip, and the output end of the first rectifying chip is connected with the switch module.
8. The switching power supply according to claim 7, wherein the first isolation transformer has a second secondary branch, a positive output terminal of the second secondary branch is connected to the power supply terminal of the first PWM controller through a diode, and a positive output terminal of the second secondary branch is connected to the first charging capacitor through the diode.
9. The switching power supply according to claim 6, wherein the second rectification module comprises:
the primary side branch of the second isolation transformer is connected with the second RCD absorption circuit in parallel, and the primary side branch is connected with the input end and the output end of the second rectification control switch tube in series; and a first secondary side branch of the second isolation transformer is connected with the input end of the second rectifying chip, and the output end of the second rectifying chip is connected with the switch module.
10. The switching power supply according to claim 9, wherein the second isolation transformer has a second secondary branch, a positive output terminal of the second secondary branch is connected to the power supply terminal of the second PWM controller through a diode, and a positive output terminal of the second secondary branch is connected to the second charging capacitor through the diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220969370.6U CN217904273U (en) | 2022-04-25 | 2022-04-25 | Switching power supply with wide output voltage range |
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| CN202220969370.6U CN217904273U (en) | 2022-04-25 | 2022-04-25 | Switching power supply with wide output voltage range |
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